Cvx/bug/1

Hey guys, the previous commit on cvx_ecos.m is a bit buggy.  The rearrangement of output variables to reflect dualism seems right, but the negative on full(b) needed to be restored to get output to match SeDuMi.

I wasn't sure whether the variable names passed to cvx_run_solver should match the variable names for ECOS or the undualized version coming back to Matlab; I went with ECOS.  In any case, a fix is needed for the variable names as there weren't enough names included in previous version.